A tiny robotic ball able to be controlled by a smartphone doesn't exactly need any more selling points, but Orbotix's Sphero now has an extra one nonetheless. It's been outfitted with a chariot that can be used for FaceTime sessions or low-level surveillance -- or chariot races around your office, naturally. Of course, this is strictly a DIY affair, but we're guessing this is one project you will actually want to do yourself once you see the video after the break.
As you may know, crafting a katana is a delicate process that involves carefully constructing a razor-sharp high-carbon edge around a soft shock-absorbent core. One day though, smiths and forging fires could be replaced by electrode-wielding mad-scientists, with the technology to selectively harden and soften metal at will. At least that's what we envisioned when we read about Jörg Weißmüller's breakthrough research in the field of nanomaterials. The German scientist discovered that by placing precious metals in acid he could create tiny ducts through corrosion. Once those channels are flooded with a conductive liquid, electrical currents can be used to harden the material and, if you change your mind about the brittle results, the effect can easily be reversed to make it soft again. The tech could eventually lead to self-healing vehicle armor or scratch-resistant cellphones -- but, really, we just want to zap our way to a high-quality samurai sword. Physorg
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